99.9% of the time, footage shown at Comic-Con in Hall H is never released online. However, just like at the Star Wars Celebration earlier this year, it appears as if Warner Bros. will release the second trailer for Batman v Superman: Dawn of Justice moments after their presentation wraps up.
Of course, there's every chance that they'll wait until nearer the release of Ant-Man to release it online (that is after all the movie it will most likely be attached to), but with Periscope running rampant at the event this year, they probably won't want to risk it being leaked like the last trailer!
While this preview will no doubt be released online, those attending Comic-Con are probably going to be treated to an extended or different version. For now, you'll have to stay tuned to CBM for updates on the next Batman v Superman trailer, but details can be found in the Tweet below.